indexing - Find query using $and operator cannot using index in MongoDB -

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i have documents structured below, each array element contains "n" , "v" key , value different types of data. (collection name doc)

    {          "_id" : 1,          "logs" : [             { "n" : "facility", "v" : 26 },             { "n" : "num", "v" : 6 },             { "n" : "ip", "v" : "137.68.151.104" },             { "n" : "protocol", "v" : "55902/udp" },             { "n" : "port", "v" : "53" }          ]     },     {          "_id" : 2,          "logs" : [              { "n" : "facility", "v" : 26 },              { "n" : "num", "v" : 6 },             { "n" : "ip", "v" : "137.68.160.51" },              { "n" : "protocol", "v" : "13438/tcp" },              { "n" : "port", "v" : "13438" }          ]     },     {          "_id" : 3,         "logs" : [             { "n" : "facility", "v" : 26 },             { "n" : "num", "v" : 6 },              { "n" : "ip", "v" : "137.68.160.51" },              { "n" : "protocol", "v" : "13434/tcp" },             { "n" : "port", "v" : "53" }          ]     },     {          "_id" : 4,         "logs" : [             { "n" : "facility", "v" : 26 },             { "n" : "num", "v" : 6 },              { "n" : "ip", "v" : "137.68.160.184" },             { "n" : "protocol", "v" : "61662/udp" },             { "n" : "port", "v" : "53" }          ]     },     {          "_id" : 5,          "logs" : [              { "n" : "facility", "v" : 26 },             { "n" : "num", "v" : 6 },              { "n" : "ip", "v" : "137.68.160.51" },              { "n" : "protocol", "v" : "13435/tcp" },              { "n" : "port", "v" : "13435" }          ]     },     {          "_id" : 6,         "logs" : [              { "n" : "facility", "v" : 26 },             { "n" : "num", "v" : 6 },             { "n" : "ip", "v" : "137.68.160.51" },             { "n" : "protocol", "v" : "61662/udp" },             { "n" : "port", "v" : "53" }         ]    }    ...

and indexing below.

>db.doc.getindexes() [ {   "v" : 1,     "key" : {       "_id" : 1     },     "name" : "_id_",     "ns" : "db_test.doc" }, {   "v" : 1,   "key" : {     "logs.n" : 1,     "logs.v" : 1   },   "name" : "logs.n_1_logs.v_1",   "ns" : "db_test.doc" } ]

i want query condition. "ip" "137.68.160.51" , "port" "53"

so, query this.

db.doc.find ( {"$and" : [ {"logs" : { "$elemmatch" : { "n" : "ip", "v" : "137.68.160.51" } } }, {"logs" : { "$elemmatch" : {  "n" : "port", "v" : "53" } } } ]})

but, query slow. (over 30seconds) ("ip" == "137.68.160.51" document count 10,000,000 . , result document count nothing.)

i think, mongodb cannot using index when second query using $and operator.

if query, b query , c query using $and operator, $and : [ {a}, {b}, {c} ] . b , c query cannot using index. right?


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